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4 1 1 1 1 1 Rating 4.00 (6 Votes)

Online calculators


One-layer inductance coil calculator:

If you need to make homebrew inductance coil for the matching circuit, for amplifier, for magic crystal radio etc, you have some question:

  • how many turns have the coil
  • which diameter and length of winding
  • which wire is needed to use

The design of winding you have to choose empirically by the following common advice. Most of online calculators enable to find inductance of the coil knowing its winding dimensions and number of turns.  This calculator help for you to estimate number of turns of the your homebrew onelayer R.F. inductor or choke on design stage. The calculator uses Bob Weaver's equation with round wire corrections. The windows version of Coil32 makes it possible to calculate the self-capacitance and Q-factor of the single-layer coil.

Calculate number of turns


on-line one-layer inductance coil calculator
on-line one layer inductor solenoid calculator
Select units:   AWG →   SWG → 

L – Required inductance
D   – Diameter of coil-former
d   – Diameter of wire without insulation    
k   – Diameter of wire with insulation Automatic

N – number of turns
l   – Length of winding
Clear all

 Coil32 also estimates Q-factor and self-capacity of the single-layer RF coil.

Below you can see the references to best online calculators by my opinion, that enable to find inductance of the ready-made inductor.


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